STEAM AND HOT-AIR STERILIZING. 175 



pended from a glass rod, which may be placed inside 

 the oven, extending across its top from one side to the 

 other. 



Place several of the infected threads in the centre of 

 a bundle of rags. Subject this to a temperature necessary 

 to sterilize the threads by the dry method. Treat 

 another similar bundle to sterilization by steam. In 

 what way do the two processes differ? 



